<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta http-equiv="X-UA-Compatible" content="IE=edge" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
        <script src="./Promise.js"></script>
    </head>
    <body>
        <script> 
            let p = new Promise((resolve, reject) => {
                reject('error');
                // resolve('ok');
            });


            //异常穿透
            p.then(v => {
                console.log(v);
            }).then(v => {
                console.log(v);
            }, r => {
                console.log(r);
                //返回 pending 状态的 promise 实例对象
                return new Promise(() => {});
            }).catch(r => {
                console.log(r);
            }).then(v => {
                console.log(v);
            }).then(abc => {
                console.log(abc);
            })
        </script>
    </body>
</html>
